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== Overview ==
== Overview ==
The most common cause of melena is [[peptic ulcer]] disease. Any other cause of bleeding from the upper gastro-intestinal tract, or even the ascending colon, can also cause melena.  Melena may also be a sign of drug overdose if a patient is taking anti-coagulants, such as warfarin. A less serious, self-limiting case of melena can occur in newborns two to three days after delivery, due to swallowed maternal blood.
The most common cause of melena is [[peptic ulcer]] disease. Any other cause of bleeding from the upper gastro-intestinal tract, or even the ascending colon, can also cause melena.  Melena may also be a sign of drug overdose if a patient is taking anti-coagulants, such as warfarin. A less serious, self-limiting case of melena can occur in newborns two to three days after delivery, due to swallowed maternal blood.


== Causes ==
==Causes==
The upper part of the GI tract will usually cause black stools due to:
===Life Threatening Causes===
* Abnormal [[blood vessel]]s (vascular [[malformation]])
Life-threatening causes include conditions which may result in death or permanent disability within 24 hours if left untreated.
* A tear in the esophagus from violent vomiting ([[Mallory-Weiss tear]])
 
* Bleeding stomach or [[duodenal ulcer]]
*[[Anthrax]]
* Inflammation of the stomach lining ([[gastritis]])
*[[Ebola virus]]
* Lack of proper blood flow to the intestines ([[bowel]] [[ischemia]])
 
* Trauma or foreign body
===Common Causes===
* Widened, overgrown veins (called [[varices]]) in the esophagus and stomach
*[[Duodenal ulcer]]
*[[Esophagitis]]
*[[Esophageal varices]]
*[[Gastric tumors]]
*[[Gastric ulcer]]
*[[Gastritis]]
*[[Mallory-Weiss syndrome]]
*[[Peptic ulcer]]
 
===Causes by Organ System===
{|style="width:80%; height:100px" border="1"
|style="height:100px"; style="width:25%" border="1" bgcolor="LightSteelBlue" |'''Cardiovascular'''
|style="height:100px"; style="width:75%" border="1" bgcolor="Beige" | [[Cholesterol embolism]], [[mesenteric ischemia|mesenteric vascular occlusion]], [[vasculitis]]
|-
|bgcolor="LightSteelBlue"| '''Chemical/Poisoning'''
|bgcolor="Beige"| [[Arsenic trioxide]], [[arsenicals]], [[corrosive|caustic ingestion]], [[ethylene glycol]], [[mercury]]
|-
|-bgcolor="LightSteelBlue"
| '''Dental'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Dermatologic'''
|bgcolor="Beige"| Craniomandibular dermatodysostosis, [[Degos disease]], [[dermatomyositis]], [[hereditary haemorrhagic telangiectasia]], [[Osler-Weber-Rendu syndrome]], [[vasculitis]]
|-
|-bgcolor="LightSteelBlue"
| '''Drug Side Effect'''
|bgcolor="Beige"| [[Alendronate]], [[alosetron]], [[anticoagulants]], [[aspirin]], [[bevacizumab]], [[Bicalutamide]], [[Ceftibuten]], [[clopidogrel]], [[Cidofovir]], [[colchicine]], [[dicoumarol]], [[indomethacin]], [[iron|iron compounds]], [[melarsoprol]], [[Meropenem]], [[miltefosine]], [[Nilutamide]], [[NSAIDS]], [[Oxaprozin]], [[Pergolide]], [[phenprocoumon]], [[phenylbutazone]], [[potassium chloride]], [[quinidine]], [[sertraline]], [[tetracycline]], [[Tiagabine]], [[warfarin]], [[zinc]], ziv-aflibercept, [[Zonisamide]]
|-
|-bgcolor="LightSteelBlue"
| '''Ear Nose Throat'''
|bgcolor="Beige"| [[Hereditary haemorrhagic telangiectasia]], [[Osler-Weber-Rendu syndrome]]
|-
|-bgcolor="LightSteelBlue"
| '''Endocrine'''
|bgcolor="Beige"| [[Carcinoid]]
|-
|-bgcolor="LightSteelBlue"
| '''Environmental'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Gastroenterologic'''
|bgcolor="Beige"| [[Alcoholic cirrhosis]], [[alcoholic fatty liver]], [[anal fissure]], [[angiodysplasia]], aortoenteric fistula, [[Banti's syndrome]], [[biliary atresia]], [[bowel ischemia]], [[bowel obstruction]], [[volvulus|bowel strangulation]], [[Budd-Chiari syndrome]], [[portal vein thrombosis|chronic portal vein thrombosis]], coats plus syndrome, [[solitary rectal ulcer syndrome|colitis cystica profunda]], [[colitis]], [[diverticulosis|colonic diverticulosis]], [[colonic tubular adenomata]], [[colonic villous adenomata]], [[colonoscopy]], [[colorectal cancer]], [[Crohn's disease]], [[Degos disease]], [[Dieulafoy's lesion|Dieulafoy's ulcer]], [[polypectomy|duodenal polypectomy]], [[duodenal ulcer]], duodenal webs, [[enteric duplication cysts|duplication cysts]], [[esophageal cancer]], [[esophageal cyst]], [[esophageal varices]], [[familial adenomatous polyposis]], [[Gardner syndrome]], [[gastric antral vascular ectasia]], [[Gastric cancer]], [[gastric polyps]], [[gastric ulcer]], [[gastric volvulus]], gastric webs, [[gastritis]], [[gastroduodenal ulcers]], gastrointestinal duplications, [[hemorrhoids]], [[hemobilia]], hepatic arterioportal fistula, [[intussusception]], [[liver cirrhosis]], [[Mallory-Weiss syndrome]], [[Mallory-Weiss tear]], [[Meckel's diverticulum]], [[Ménétrier's disease]], [[mesenteric ischemia|mesenteric vascular occlusion]], [[peptic ulcer]], [[Peutz-Jeghers syndrome]], [[pneumatosis intestinalis|pneumatosis cystoides intestinalis]], [[portal hypertension]], [[portal hypertensive gastropathy]], [[proctitis]], [[esophageal varices|ruptured esophageal varices]], [[solitary rectal ulcer syndrome]], [[stomach cancer]], [[gastritis|stress gastritis]], [[peptic ulcer|stress ulcer]], [[superior mesenteric artery|superior mesenteric artery occlusion]], [[ulcerative colitis]], [[watermelon stomach]], [[Zollinger-Ellison syndrome]]
|-
|-bgcolor="LightSteelBlue"
| '''Genetic'''
|bgcolor="Beige"| [[Banti's syndrome]], [[carbamoylphosphate synthetase deficiency]], coats plus syndrome, [[Crohn's disease]], [[Ehlers-Danlos syndrome]], [[familial adenomatous polyposis]], [[Gardner syndrome]], [[hepatorenal tyrosinemia]], [[Kasabach-Merritt syndrome]], [[neurofibromatosis type I]], [[Peutz-Jeghers syndrome]], [[pseudoxanthoma elasticum]], [[Wiskott-Aldrich syndrome]]
|-
|-bgcolor="LightSteelBlue"
| '''Hematologic'''
|bgcolor="Beige"| [[coagulopathy|Blood clotting disorders]], [[carcinoid]], [[coagulopathy]], [[essential thrombocytosis]], [[hemophilia]], [[haemorrhagic disease of the newborn]], [[essential thrombocytosis|hemorrhagic thrombocythemia]], [[Henoch-Schoenlein purpura]], [[iron deficiency anemia]], [[Kasabach-Merritt syndrome]], [[systemic mastocytosis]], [[thrombocytopenia]], [[Wiskott-Aldrich syndrome]]
|-
|-bgcolor="LightSteelBlue"
| '''Iatrogenic'''
|bgcolor="Beige"| [[total parenteral nutrition|Parenteral nutrition-induced liver disease]], [[anastomosis|post-surgical anastomosis]], [[telangiectasia|radiation-induced telangiectasia]]
|-
|-bgcolor="LightSteelBlue"
| '''Infectious Disease'''
|bgcolor="Beige"| [[Acanthocephaliasis]], [[ancylostoma duodenale]], [[angiostrongyliasis]], [[anthrax]], [[bacillary dysentery]], [[balantidiasis]], [[candida albicans]], [[cytomegalovirus]], [[ebola virus]], [[entamoeba histolytica]], [[giardiasis]], [[helicobacter pylori]], [[herpes simplex virus]], [[Katayama fever ]], [[necator americanus|necator americanus (hookworm)]], [[parasites]], [[schistosoma mansoni]], [[strongyloidiasis]], [[trichuriasis]], [[typhoid fever]], [[yellow fever]]
|-
|-bgcolor="LightSteelBlue"
| '''Musculoskeletal/Orthopedic'''
|bgcolor="Beige"| Craniomandibular dermatodysostosis, [[Ehlers-Danlos syndrome]], [[pelvic fracture]]
|-
|-bgcolor="LightSteelBlue"
| '''Neurologic'''
|bgcolor="Beige"| [[Degos disease]], [[hereditary haemorrhagic telangiectasia]], Labrune syndrome, [[neurofibromatosis type I]], [[Osler-Weber-Rendu syndrome]]
|-
|-bgcolor="LightSteelBlue"
| '''Nutritional/Metabolic'''
|bgcolor="Beige"| [[Carbamoylphosphate synthetase deficiency]], [[hepatorenal tyrosinemia]], [[milk protein intolerance]]
|-
|-bgcolor="LightSteelBlue"
| '''Obstetric/Gynecologic'''
|bgcolor="Beige"| [[Choriocarcinoma]], [[endometriosis]], [[leiomyoma]]
|-
|-bgcolor="LightSteelBlue"
| '''Oncologic'''
|bgcolor="Beige"| [[Adenocarcinoma]], [[anal cancer]], [[blue rubber bleb nevus syndrome]], [[carcinoid]], [[cecum|cecal carcinoma]], [[choriocarcinoma]], [[colorectal cancer]], [[esophageal cancer]], [[familial adenomatous polyposis]], [[Gardner syndrome]], [[gastric cancer]], [[hemangioma]]s, [[kaposi sarcoma]], [[lipoma]], [[lymphoma]], [[malignancy]], [[melanoma]], [[neoplasm|mesenchymal neoplasm]], [[metastatic tumor]], [[Peutz-Jeghers syndrome]], [[small bowel cancer]], [[small bowel lymphoma]], [[tumor|small bowel tumors]], [[stomach cancer]], [[systemic mastocytosis]], [[tumors]]
|-
|-bgcolor="LightSteelBlue"
| '''Ophthalmologic'''
|bgcolor="Beige"| Coats plus syndrome
|-
|-bgcolor="LightSteelBlue"
| '''Overdose/Toxicity'''
|bgcolor="Beige"| [[Drug overdose]]
|-
|-bgcolor="LightSteelBlue"
| '''Psychiatric'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Pulmonary'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Renal/Electrolyte'''
|bgcolor="Beige"| [[Cholesterol embolism]], [[chronic renal failure]], craniomandibular dermatodysostosis, [[Henoch-Schoenlein purpura]]
|-
|-bgcolor="LightSteelBlue"
| '''Rheumatology/Immunology/Allergy'''
|bgcolor="Beige"| [[Crohn's disease]], [[dermatomyositis]], [[food allergy]], [[food allergy|food protein-induced enterocolitis syndrome (FPIES)]], [[Henoch-Schoenlein purpura]], [[microscopic polyangiitis]], [[polyarteritis nodosa]], [[systemic mastocytosis]], [[vasculitis]], [[Wiskott-Aldrich syndrome]]
|-
|-bgcolor="LightSteelBlue"
| '''Sexual'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Trauma'''
|bgcolor="Beige"| [[Trauma]]
|-
|-bgcolor="LightSteelBlue"
| '''Urologic'''
|bgcolor="Beige"| No underlying causes
|-
|-bgcolor="LightSteelBlue"
| '''Miscellaneous'''
|bgcolor="Beige"| [[Foreign body]], swallowed maternal blood
|-
|}
 
===Causes in Alphabetical Order===
{{col-begin|width=80%}}
{{col-break|width=33%}}
*[[Acanthocephaliasis]]
*[[Adenocarcinoma]]
*[[Alcoholic cirrhosis]]
*[[Alcoholic fatty liver]]
*[[Alendronate]]
*[[Alosetron]]
*[[Anal cancer]]
*[[Anal fissure]]
*[[Ancylostoma duodenale]]
*[[Angiodysplasia]]
*[[Angiostrongyliasis]]
*[[Anthrax]]
*[[Anticoagulants]]
*Aortoenteric fistula
*[[Arsenic trioxide]]
*[[Arsenicals]]
*[[Aspirin]]
*[[Bacillary dysentery]]
*[[Balantidiasis]]
*[[Banti's syndrome]]
*[[Bevacizumab]]
*[[Biliary atresia]]
*[[Blood clotting disorders]]
*[[Blue rubber bleb nevus syndrome]]
*[[Bowel ischemia]]
*[[Bowel obstruction]]
*[[volvulus|Bowel strangulation]]
*[[Budd-Chiari syndrome]]
*[[Candida albicans]]
*[[Carbamoylphosphate synthetase deficiency]]
*[[Carcinoid]]
*[[corrosive|Caustic ingestion]]
*[[cecum|Cecal carcinoma]]
*[[Ceftibuten]]
*[[Cholesterol embolism]]
*[[Choriocarcinoma]]
*[[portal vein thrombosis|Chronic portal vein thrombosis]]
*[[Chronic renal failure]]
*[[Cidofovir]]
*[[Clopidogrel]]
*[[Coagulopathy]]
*Coats plus syndrome
*[[Colchicine]]
*[[Colitis]]
*[[solitary rectal ulcer syndrome|Colitis cystica profunda]]
*[[diverticulosis|Colonic diverticulosis]]
*[[Colonic tubular adenomata]]
*[[Colonic villous adenomata]]
{{col-break|width=33%}}
*[[Colonoscopy]]
*[[Colorectal cancer]]
*Craniomandibular dermatodysostosis
*[[Crohn's disease]]
*[[Cytomegalovirus]]
*[[Degos disease]]
*[[Dermatomyositis]]
*[[Dicoumarol]]
*[[Dieulafoy's lesion|Dieulafoy's ulcer]]
*[[Drug overdose]]
*[[polypectomy|Duodenal polypectomy]]
*[[Duodenal ulcer]]
*Duodenal webs
*[[enteric duplication cysts|Duplication cysts]]
*[[Ebola virus]]
*[[Ehlers-Danlos syndrome]]
*[[Endometriosis]]
*[[Entamoeba histolytica]]
*[[Esophageal cancer]]
*[[Esophageal cyst]]
*[[Esophageal varices]]
*[[Essential thrombocytosis ]]
*[[Ethylene glycol]]
*[[Familial adenomatous polyposis]]
*[[Food allergy]]
*[[food allergy|Food protein-induced enterocolitis syndrome (FPIES)]]
*[[Foreign body]]
*[[Gardner syndrome]]
*[[Gastric antral vascular ectasia]]
*[[Gastric cancer]]
*[[Gastric polyps]]
*[[Gastric ulcer]]
*[[Gastric volvulus]]
*Gastric webs
*[[Gastritis]]
*[[Gastroduodenal ulcers]]
*Gastrointestinal duplications
*[[Giardiasis]]
*[[Haemorrhoids]]
*[[Helicobacter pylori]]
*[[Hemangioma]]s
*[[Hemobilia]]
*[[Hemophilia]]  
*[[Haemorrhagic disease of the newborn]]
*[[essential thrombocytosis|Hemorrhagic thrombocythemia]]
{{col-break|width=33%}}
*[[Henoch-Schoenlein purpura]]
*Hepatic arterioportal fistula
*[[Hepatorenal tyrosinemia]]
*[[Hereditary haemorrhagic telangiectasia]]
*[[Herpes simplex virus]]
*[[Indomethacin]]
*[[Intussusception]]
*[[iron|Iron compounds]]
*[[Iron deficiency anemia]]
*[[Kaposi sarcoma]]
*[[Kasabach-Merritt syndrome]]
*[[Katayama fever ]]
*Labrune syndrome
*[[Leiomyoma]]
*[[Lipoma]]
*[[Liver cirrhosis]]
*[[Lymphoma]]
*[[Malignancy]]
*[[Mallory-Weiss syndrome]]
*[[Mallory-Weiss tear]]
*[[Meckel's diverticulum]]
*[[Melanoma]]
*[[Melarsoprol]]
*[[Ménétrier's disease]]
*[[Mercury]]
*[[neoplasm|Mesenchymal neoplasm]]
*[[Mesenteric vascular occlusion]]
*[[Metastatic tumor]]
*[[Microscopic polyangiitis]]
*[[Milk protein intolerance]]
*[[necator americanus|Necator americanus (hookworm)]]
*[[Neurofibromatosis type I]]
*[[Nilutamide]]
*[[NSAIDS]]
*[[Osler-Weber-Rendu syndrome]]
*[[Oxaprozin]]
*[[total parenteral nutrition|Parenteral nutrition-induced liver disease]]
*[[Pelvic fracture]]
*[[Peptic ulcer]]
*[[Pergolide]]
*[[Peutz-Jeghers syndrome]]
*[[Phenprocoumon]]
*[[Phenylbutazone]]
*[[pneumatosis intestinalis|Pneumatosis cystoides intestinalis]]
*[[Polyarteritis nodosa]]
*[[Portal hypertension]]
*[[Portal hypertensive gastropathy]]
*[[anastomosis|Post-surgical anastomosis]]
*[[Potassium chloride]]
{{col-break|width=33%}}
*[[Proctitis]]
*[[Pseudoxanthoma elasticum]]
*[[Quinidine]]
*[[telangiectasia|Radiation-induced telangiectasia]]
*[[esophageal varices|Ruptured esophageal varices]]
*[[Schistosoma mansoni]]
*[[Small bowel cancer]]
*[[Small bowel lymphoma]]
*[[tumor|Small bowel tumors]]
*[[Solitary rectal ulcer syndrome]]
*[[Stomach cancer]]
*[[gastritis|Stress gastritis]]
*[[peptic ulcer|Stress ulcer]]
*[[Strongyloidiasis]]
*[[superior mesenteric artery|Superior mesenteric artery occlusion]]
*Swallowed maternal blood
*[[Systemic mastocytosis]]
*[[Tetracycline]]
*[[Thrombocytopenia]]
*[[Tiagabine]]
*[[Trauma]]
*[[Trichuriasis]]
*[[Tumors]]
*[[Typhoid fever]]
*[[Ulcerative colitis]]
*[[Vasculitis]]
*[[Warfarin]]
*[[Watermelon stomach]]
*[[Wiskott-Aldrich syndrome]]
*[[Yellow fever]]
*[[Zinc]]
*Ziv-aflibercept
*[[Zollinger-Ellison syndrome]]
{{col-end}}


== References ==
== References ==
{{reflist|2}}
{{Reflist|2}}
{{WH}}
{{WS}}
 
[[Category:Gastroenterology]]
[[Category:Gastroenterology]]
[[Category:Signs and symptoms]]
[[Category:Mature chapter]]
[[Category:Mature chapter]]
[[Category:primary care]]
[[Category:Crowdiagnosis]]
[[Category:Needs content]]
{{WH}}
 
{{WS}}

Latest revision as of 22:40, 29 July 2020

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Ogheneochuko Ajari, MB.BS, MS [2]

Overview

The most common cause of melena is peptic ulcer disease. Any other cause of bleeding from the upper gastro-intestinal tract, or even the ascending colon, can also cause melena. Melena may also be a sign of drug overdose if a patient is taking anti-coagulants, such as warfarin. A less serious, self-limiting case of melena can occur in newborns two to three days after delivery, due to swallowed maternal blood.

Causes

Life Threatening Causes

Life-threatening causes include conditions which may result in death or permanent disability within 24 hours if left untreated.

Common Causes

Causes by Organ System

Cardiovascular Cholesterol embolism, mesenteric vascular occlusion, vasculitis
Chemical/Poisoning Arsenic trioxide, arsenicals, caustic ingestion, ethylene glycol, mercury
Dental No underlying causes
Dermatologic Craniomandibular dermatodysostosis, Degos disease, dermatomyositis, hereditary haemorrhagic telangiectasia, Osler-Weber-Rendu syndrome, vasculitis
Drug Side Effect Alendronate, alosetron, anticoagulants, aspirin, bevacizumab, Bicalutamide, Ceftibuten, clopidogrel, Cidofovir, colchicine, dicoumarol, indomethacin, iron compounds, melarsoprol, Meropenem, miltefosine, Nilutamide, NSAIDS, Oxaprozin, Pergolide, phenprocoumon, phenylbutazone, potassium chloride, quinidine, sertraline, tetracycline, Tiagabine, warfarin, zinc, ziv-aflibercept, Zonisamide
Ear Nose Throat Hereditary haemorrhagic telangiectasia, Osler-Weber-Rendu syndrome
Endocrine Carcinoid
Environmental No underlying causes
Gastroenterologic Alcoholic cirrhosis, alcoholic fatty liver, anal fissure, angiodysplasia, aortoenteric fistula, Banti's syndrome, biliary atresia, bowel ischemia, bowel obstruction, bowel strangulation, Budd-Chiari syndrome, chronic portal vein thrombosis, coats plus syndrome, colitis cystica profunda, colitis, colonic diverticulosis, colonic tubular adenomata, colonic villous adenomata, colonoscopy, colorectal cancer, Crohn's disease, Degos disease, Dieulafoy's ulcer, duodenal polypectomy, duodenal ulcer, duodenal webs, duplication cysts, esophageal cancer, esophageal cyst, esophageal varices, familial adenomatous polyposis, Gardner syndrome, gastric antral vascular ectasia, Gastric cancer, gastric polyps, gastric ulcer, gastric volvulus, gastric webs, gastritis, gastroduodenal ulcers, gastrointestinal duplications, hemorrhoids, hemobilia, hepatic arterioportal fistula, intussusception, liver cirrhosis, Mallory-Weiss syndrome, Mallory-Weiss tear, Meckel's diverticulum, Ménétrier's disease, mesenteric vascular occlusion, peptic ulcer, Peutz-Jeghers syndrome, pneumatosis cystoides intestinalis, portal hypertension, portal hypertensive gastropathy, proctitis, ruptured esophageal varices, solitary rectal ulcer syndrome, stomach cancer, stress gastritis, stress ulcer, superior mesenteric artery occlusion, ulcerative colitis, watermelon stomach, Zollinger-Ellison syndrome
Genetic Banti's syndrome, carbamoylphosphate synthetase deficiency, coats plus syndrome, Crohn's disease, Ehlers-Danlos syndrome, familial adenomatous polyposis, Gardner syndrome, hepatorenal tyrosinemia, Kasabach-Merritt syndrome, neurofibromatosis type I, Peutz-Jeghers syndrome, pseudoxanthoma elasticum, Wiskott-Aldrich syndrome
Hematologic Blood clotting disorders, carcinoid, coagulopathy, essential thrombocytosis, hemophilia, haemorrhagic disease of the newborn, hemorrhagic thrombocythemia, Henoch-Schoenlein purpura, iron deficiency anemia, Kasabach-Merritt syndrome, systemic mastocytosis, thrombocytopenia, Wiskott-Aldrich syndrome
Iatrogenic Parenteral nutrition-induced liver disease, post-surgical anastomosis, radiation-induced telangiectasia
Infectious Disease Acanthocephaliasis, ancylostoma duodenale, angiostrongyliasis, anthrax, bacillary dysentery, balantidiasis, candida albicans, cytomegalovirus, ebola virus, entamoeba histolytica, giardiasis, helicobacter pylori, herpes simplex virus, Katayama fever , necator americanus (hookworm), parasites, schistosoma mansoni, strongyloidiasis, trichuriasis, typhoid fever, yellow fever
Musculoskeletal/Orthopedic Craniomandibular dermatodysostosis, Ehlers-Danlos syndrome, pelvic fracture
Neurologic Degos disease, hereditary haemorrhagic telangiectasia, Labrune syndrome, neurofibromatosis type I, Osler-Weber-Rendu syndrome
Nutritional/Metabolic Carbamoylphosphate synthetase deficiency, hepatorenal tyrosinemia, milk protein intolerance
Obstetric/Gynecologic Choriocarcinoma, endometriosis, leiomyoma
Oncologic Adenocarcinoma, anal cancer, blue rubber bleb nevus syndrome, carcinoid, cecal carcinoma, choriocarcinoma, colorectal cancer, esophageal cancer, familial adenomatous polyposis, Gardner syndrome, gastric cancer, hemangiomas, kaposi sarcoma, lipoma, lymphoma, malignancy, melanoma, mesenchymal neoplasm, metastatic tumor, Peutz-Jeghers syndrome, small bowel cancer, small bowel lymphoma, small bowel tumors, stomach cancer, systemic mastocytosis, tumors
Ophthalmologic Coats plus syndrome
Overdose/Toxicity Drug overdose
Psychiatric No underlying causes
Pulmonary No underlying causes
Renal/Electrolyte Cholesterol embolism, chronic renal failure, craniomandibular dermatodysostosis, Henoch-Schoenlein purpura
Rheumatology/Immunology/Allergy Crohn's disease, dermatomyositis, food allergy, food protein-induced enterocolitis syndrome (FPIES), Henoch-Schoenlein purpura, microscopic polyangiitis, polyarteritis nodosa, systemic mastocytosis, vasculitis, Wiskott-Aldrich syndrome
Sexual No underlying causes
Trauma Trauma
Urologic No underlying causes
Miscellaneous Foreign body, swallowed maternal blood

Causes in Alphabetical Order

References

Template:WH Template:WS

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